18409313563 has 2 divisors, whose sum is σ = 18409313564. Its totient is φ = 18409313562.

The previous prime is 18409313561. The next prime is 18409313623. The reversal of 18409313563 is 36531390481.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18409313563 - 2¹ = 18409313561 is a prime.

Together with 18409313561, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18409313561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9204656781 + 9204656782.

It is an arithmetic number, because the mean of its divisors is an integer number (9204656782).

Almost surely, 2^18409313563 is an apocalyptic number.

18409313563 is a deficient number, since it is larger than the sum of its proper divisors (1).

18409313563 is an equidigital number, since it uses as much as digits as its factorization.

18409313563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 43.

The spelling of 18409313563 in words is "eighteen billion, four hundred nine million, three hundred thirteen thousand, five hundred sixty-three".